diff options
Diffstat (limited to 'sys/arm/versatile/versatile_scm.c')
| -rw-r--r-- | sys/arm/versatile/versatile_scm.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/sys/arm/versatile/versatile_scm.c b/sys/arm/versatile/versatile_scm.c new file mode 100644 index 000000000000..835d2381075d --- /dev/null +++ b/sys/arm/versatile/versatile_scm.c @@ -0,0 +1,144 @@ +/* + * Copyright (c) 2017 Oleksandr Tymoshenko <gonzo@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Ben Gray. + * 4. The name of the company nor the name of the author may be used to + * endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * SCM - System Control Module + */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/bus.h> +#include <sys/resource.h> +#include <sys/rman.h> +#include <sys/lock.h> +#include <sys/mutex.h> + +#include <machine/bus.h> +#include <machine/resource.h> + +#include <dev/ofw/openfirm.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include "versatile_scm.h" + +struct versatile_scm_softc { + device_t sc_dev; + struct resource * sc_mem_res; +}; + +static struct versatile_scm_softc *versatile_scm_sc; + +#define versatile_scm_read_4(sc, reg) \ + bus_read_4((sc)->sc_mem_res, (reg)) +#define versatile_scm_write_4(sc, reg, val) \ + bus_write_4((sc)->sc_mem_res, (reg), (val)) + +static int +versatile_scm_probe(device_t dev) +{ + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_is_compatible(dev, "syscon")) + return (ENXIO); + + if (versatile_scm_sc) { + return (EEXIST); + } + + device_set_desc(dev, "Versatile Control Module"); + return (BUS_PROBE_DEFAULT); +} + +static int +versatile_scm_attach(device_t dev) +{ + struct versatile_scm_softc *sc; + int rid; + + sc = device_get_softc(dev); + sc->sc_dev = dev; + + rid = 0; + sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); + + if (sc->sc_mem_res == NULL) { + device_printf(dev, "could not allocate memory resources\n"); + return (ENXIO); + } + + versatile_scm_sc = sc; + + return (0); +} + +int +versatile_scm_reg_read_4(uint32_t reg, uint32_t *val) +{ + if (!versatile_scm_sc) + return (ENXIO); + + *val = versatile_scm_read_4(versatile_scm_sc, reg); + return (0); +} + +int +versatile_scm_reg_write_4(uint32_t reg, uint32_t val) +{ + if (!versatile_scm_sc) + return (ENXIO); + + versatile_scm_write_4(versatile_scm_sc, reg, val); + return (0); +} + +static device_method_t versatile_scm_methods[] = { + DEVMETHOD(device_probe, versatile_scm_probe), + DEVMETHOD(device_attach, versatile_scm_attach), + + DEVMETHOD_END +}; + +static driver_t versatile_scm_driver = { + "scm", + versatile_scm_methods, + sizeof(struct versatile_scm_softc), +}; + +static devclass_t versatile_scm_devclass; + +EARLY_DRIVER_MODULE(versatile_scm, simplebus, versatile_scm_driver, versatile_scm_devclass, 0, 0, + BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); |